Radio telephone receiver



HONE RECEIVER ,4 TTOHNEY i Patented v.May 1 2, 192.5.

UNITED-- STATES l rimas W. NIELsE-N, or NEWARK-,NEW JERSEYQ 1;-

4 RADIO TnImPHoNE RECEIVER.

l Application sied May 25,*19225 serial1ro'.563,562."l

To all-whom t 'may foncer-iz.: Be itknown that I, EINAR W. NinnsnN, acltizen of the United States, residing at Nevvarlginthe 'county of Essex and State` ofNeW Jersey, have invented new and usefulImprovements in Radio Telephone Receivers, ofxvhi'ch `the following is a specifi cation. v

p One object ofthe invention is to providev a, particularly sensliive receiver suited for aerial or radio Work, compaet'and convenrangement.

Another purpose is in the provision of a novel andeifectivetype of magnet by which superior results'ar'e attained.

These andAv other like aims, such as simplicity, durability Aand neatness of appear-v ance are attained by the novel construction, comblnation and arrangement of parts hereinafter describedrand shown in the accompan in'gdravving forming almaterial. part his disclosure, and in which Figure l is a top plan View of an embodiment 4ofthe invention, parts being broken awayto show the interior.

. Figure 2 .is'a transverse sectional .View

-Figure 3 is a., fragment-ary sectional View taken on line 3 3 of Fig. 1.

Figure 4 is a side elevational view of one of thecores showing its initial winding and heads.

. AFi re 5 is a perspective view ot the magnet rawn to a reduced scale.

The receiver casing Ais of conventional form, convenient size and made of usual non-conducting material, the sanie comprising a cylindrical cup having a iiat base or bottom wall 10 and side wall 11 formed with areduced screw-threaded upper portion 12.

Connecting by the screw-thread is the anged portion' 13 of a cup 14 haring a concave outer surface 15 and containing a central opening 16.

An annularseal T, on the inner side of' the cup, registers with the top of theA cup and c'lam )ed firmly at its edge therebetween is a diap ragni or membrane 18 which acts \\.bottom 10 of the cup is a circular plate 19 as the armature of the magnet later described.

Resting on the level innei` surface of the of insulating materialas fibre, cardboard,

iently. handled without -danger of disar-l Vand also at their bottom to reston'tliilihsftsb..

.between which the Wires'arejcoiled which ,PATENT-, OFFICE:

etc. and mounted thereint is'a' disjcf20'VV of,

chromium steel, "slightly less' in diameter than the plate 19 but ot considerable thick? ness preferably approximating one fifth 'of '60' the depth ofthe cup chamber, and 'oonstituting the base element of a magnet.

Said disc 20 contains two circular openings 21 and 2l spacedv a predetermined distance apart on -its center line andbetweenv l thesefho'les is a longitudinal slot 22 extending 'at a Aright angle to the plane" o fj'tlie openings 2l-21 and terminating in {circular venlargements 23 and 23 atits ends.'

The pole pieces of cores 24 and 24uof'tl1e 70 magnet may be of soft ironin 'the form of'.

' ro'und posts',rednced at' one end,"asla'tlv 2,551 to lit 'the' openings 21'into which-they-'ar'e securely riveted. bringing the slunilderedE eil larged portionV into rigid e11gag'enient`ivith75i the surface `of the magnet 20.

"Fixed tothe magnet cores"24. t fittipoints slightly below their free'upp'ere'iidsA are `fibre washers 26 constituting Spool iend' energize' the magnet. 1 The irst or inner coils 27 'on 'each-indre;

arel wound from independnt'bare wires-androverl'aid by coils ofthe saine Wir'fmsiilatdin the usual manner, to the-fnll diameterff ends 29 and 29 'of the magnet coils 'being the spools 28 and 281,' the outergeiztending engaged with separate connectionsv as shown.

inrFigure 1 and :further described. f 90 It is to be noted that the bare inner ,are directly grounded* on the coes2fl and 24', which are in electrical connection Witheaeh other by reaso'n Vof the plateA 20 .ya

which they are fixed, and which forms of thecircuit.

Said connections consist of a pair of nsulating bushings 30 passe'dthrough'iopenings appropriately forinedin'the cu toni 10A and plate 19, andvthe'nc-el through 'thf openings 23--'23 inthe magnet 20, the

ies

openings in which are engagedthe ends of the wires 29-29 leading from the respective coils 28-28. v

From the foregoing it will beseen that each pole of the magnet is directly connect` ed to its corresponding binding post inde-' pendently, that the magnet base is circular and of relatively hard material and that pro- -vision is made therein for the lines of force by the slot 22, forming a novel and effective device of unusual sensitiveness Although the improvements have been describedwith considerable detail, it is' not desired to be limited exactly thereto since changes and modifications may well be made without departingfrom the spirit and scope of the invention in its broadest aspect.

Having thus described my invention, what ,l claim as newand desire to secure by Let# ters Patent, isza 1; A receiver of thc type described comprising a shallow cup shaped casing having l a fiat bottom, a cover engaged therewith both casing and cover being composedof dielectric material, a diaphragm clamped between said cup and cover, aninsnlating disc in the bottoni of said cup, a circular magnet seated on said disc, apair of cores fixed in said magnet, a bare wire wound helically on each cre, insulated contiiiuations of said Wire coiled thereover, and insulated binding posts extending through the bottom of said cup, disc and magnet, said posts being cleft at the inner ends presenting V- shaped openings to engage the terminal wires from one of said core windings.

22 A radio telephone receiver comprising a shallow, flat-bottomed cup, a cover removably engaged therewith, both casing and cover being composed of dielectric material av diaphragm clamped between the edges'of said 'cup and cover, an insulated disc of chromium steel fixed in said cnp foi-minrr the base element of a magnet, 'pole pieces zfixed in spaced relation at the center of said disc, 'said pole pieces extending adjacent said diaphragm, independent insulated wires coiled on said pole pieces, insulating bushings passing through said cup and disc, binding posts having stems encased in said bushings, meanson the stems for clamping said bushings, said bushings being diametrically o posed to said ole pieces, and cones at t 1e inner ends of tlie stems sharply cleft to frictionally engage with thetern'iinals of the respective windings by frictional contact only. A

8. In a radio telephone ieceiver, the combination with a cup, a cover and a' diaphragm clamped therebetween, of a magnet comprising a circular disc of steel having an elongated slot passing through its center leading to circular openings at its end, a pair of iron cores fixed on. opposite sides of the slot at the center, windings on said cores, a pair of binding posts, insulated bushings, fixed in said cup and passing through the openings in said disc through which said posts pass, and la conical inner enden 'each post having a Wedge shaped slot to receive .the terminal wires from each winding.

4. In a. radio telephone receiver, the coinbination with a cup, a cover and adiaphragm clamped therebetween, of a magnet comprisin a' circular .insulated steel disc substantia ly fitting the interior of said cup and held to the bottom thereof, said disc having an enlon ated ogen slot, a pair of iron cores riveted to sai disc one on each sideof the slot, insulating) bushings at theA ends of the slot, said ushings passing through the bottoinof said cup, screw threadf Y ed stems passing through said bushings, means' on said stems for engaging said bush-v ings in fixed position', bind magnet elements fixed on said field magnet upon op o'site sides of the slot therein.

6. A ed field ma et of circular shape having an elongate open slot passing through its center, a. Apair o'f electro-magnet elements fixed on said field magnet upon o posite sides of the slot therein, and a bin mg post associated with each electro-magnet element.

7. In a radio telephone receiver', the com? 'bination with aicup having a cover and a diaphragm clamped therebetween, ofa magnet comprising a Steel base fixed in said cup, a pair of iron cores in electrical engagement with said base, a coil of'insulated wire wound on' each core, the innermost vinding being grounded on the cores, a pair of bindingposts adjustably mounted 'in said cup ing posts on the outer ends of said stems, connecting elements open slot passing through its center, and 'a pair of'electro to extend through the bottoni thereof, said binding'posts having conical ends containing wedge shaped recesses, and connections between the outer windings of said coils and the recesses in the `cores binding posts.

-This specification signed and witnessed this 20th day of May, 1922.

. EINAR lV. ."TELSEN W tnesses:

Fnnnx C. Fiscnsn, FEnDINnNn Nomi. 

